DJM 2000 Randomly powering off mid set.

I am having a problem with my DJM2000 shutting off mid set on me. I need to cycle the power switch to get it to turn on again. I'm not sure why. I have changed power source, cables, run lengths, it happens at least once or twice a night. and it appears to be random. Any idea on why. or how we can get it fixed?